2006-06-11 12:55:22 · 8 answers · asked by russell s 1 in Science & Mathematics ➔ Mathematics
-15,3
2006-06-11 12:57:22 · answer #1 · answered by xtowgrunt 6 · 0⤊ 0⤋
Let X and Y be the two numbers,
XY = -45 ... (1)
X+Y = -12 ... (2)
Substitute (2) into (1)
X (-X -12) = -45
-X^2 - 12X = -45
X^2 +12X-45 =0
Factorize,
(X - 3)(X + 15) =0
X = 3 or X = -15
When X = 3, Y = -15
When X = -15, Y = 3
The two numbers are 3 and -15.
2006-06-11 22:35:06 · answer #2 · answered by ideaquest 7 · 0⤊ 0⤋
hmm ..
x+y = -12
x = -12 -y
..........
x*y = -45
(-12-y) * y = -45
-y^2 - 12y + 45 = 0
(y + 15)* (y - 3) = 0
y= -15 or y = 3 ...
check the answer ... guess it would be
-15 and +3
2006-06-11 20:01:29 · answer #3 · answered by atheistforthebirthofjesus 6 · 0⤊ 0⤋
-15 & 3
2006-06-11 19:58:35 · answer #4 · answered by Noodles 1 · 0⤊ 0⤋
-15, 3
2006-06-11 19:57:49 · answer #5 · answered by Jill&Justin 5 · 0⤊ 0⤋
xy = -45
x + y = -12
x + y = -12
y = -x - 12
xy = -45
x(-x - 12) = -45
x(-(x + 12)) = -45
-x(x + 12) = -45
x(x + 12) = 45
x^2 + 12x = 45
x^2 + 12x - 45 = 0
(x - 3)(x + 15) = 0
x = 3 and -15
ANS : 3 and -15
2006-06-11 22:30:15 · answer #6 · answered by Sherman81 6 · 0⤊ 0⤋
-15 and 3 how easy
2006-06-11 19:59:09 · answer #7 · answered by nuzzie 2 · 0⤊ 0⤋
Yep, the answer is -15, 3...
Everyone is right.
a+b = -12
ab = -45
a²+2ab+b² = 144
a²+b² = 234
aagghhh...
2006-06-11 20:03:37 · answer #8 · answered by Anonymous · 0⤊ 0⤋